Which of the following statements concerning ring satellites of the planets is true?

Which of the following statements concerning ring satellites of the planets is true? a. They are thin, solid disks revolving around the parent planets in polar orbits. b. They consist of bodies that range in size from very tiny "smoke-size" particles to small "moonlets". c. Their structure is never influenced by other planetary satellites. d. They are present around Saturn and Jupiter, but not around Uranus and Neptune